Window fan



FIG. 1 is a front perspective view of a window fan showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a right side view thereof, the left side view being a mirror image of the right side view;

FIG. 4 is a rear view thereof; and,

FIG. 5 is a top view thereof.

In FIG. 1, the broken line disclosure of the window is for illustrative purposes only and forms no part of the claimed design.

In FIGS. 1, 2, 3, the broken line disclosure of a fan's air intake is for illustrative purposes only (e.g., it may be a one or more screens or grills of various shapes) and forms no part of the claimed design.

In FIG. 4, the broken line disclosure of fan blades and size adjusting means is for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a window fan, as shown and described. 